Jack



H. T. GIBBARD.

. JACK.

APPLICATION FILED FEB. 27: 1920.

Patented May 24, 1921.

3 SHEEIS-SHEET l.

H. T. GI'BBIARD.

JACK.

APPLICATION FILED FEB.27,192o.v

1 ,379,01 1 Patented May 24, 1921.

3 SHEEISSHEET H. T. GIBBARI].

JACK. I

APPLICATION FILED FEB. 27, 1920.

Q3 a 1m We y gvwento'o HENRY T. GIBZBARD, OF HIGHLAND PARK, MICHIGAN.

JACK.

S'peciflcatlon 01' Letters Patent.

, Application filed February 27, 1920. Serial No. 861,794.

To all whom it may concern:

Be it known that I, HENRY T. GIBBARD, a citizen of the United States, residing at Highland Park, in the county of Wayne and State of ,Michigan, have invented certain new and useful Improvements in Jacks, of which the following is a specification.

This invention relates to jacks, and has i for its object a double action jack, that is,

a jack which delivers a working stroke on both the up and the down movement of the lever.

Another feature of this invention is an improved arrangement of telescoping screws to increase the liftin range of the jack in proportion to the height of the jack standard. An automatic arrangement for bringing one screw into lifting o eration when the other screw has reached t e limit of its range of movement is provided. These and other objects will better appear when described in full.

In the drawings, I

Figure 1 is a fragmentary side elevation of the jack showing theoperating parts adj acent the handle.

- Fig. 2 is a plan View of the jack, part of the jack being shown in cross section on the jack.

stub shafts c are passed throng line 2-2 Of Fig; 3.

Fig. 3 is a vertical section through, the

Fig.4 is an elevation of the jack housing or standard.

Fig. 5 is an elevation of the same taken at a position 90 degrees removed.

Fig. 6 is a section taken on the line 6-6 of Fig. 3. v

Fig. 7 is a section showing an inverted lan view of the nut that is arranged to lift the inner screw.

Fig. 8 is a detail of the ring used in the operation of the keys that couple the lower nut and the driven gear.

Fig. 9 is a collection of detail-views showing the two-part pin used tosupport the do Fig. 10 is a section on the line 10-10 of Fi 2'.

g designates the housing, which is made of two pressed-steel half sectlons welded together at their edges and welded to the base 1). Before these are welded to ether the tions in the sidesof the sections until the collars e strike against the sections. Thereupon the ends 7 are upset and this together with the collar e serves to securely lock the gear-supportin stub shaft to the standard or houslng. ach of the gear-supporting shafts 0 1s perforated to receive the cotter p n 9 for holding the lever ends and beveled gears h -on to theshafts and in mesh with the horizontal beveled ear 7'. To the top of the gear j is fastened, y screws, a toothed ring 2' adapted to gnesh with the teeth In of the nut Z when the nut bears down on the plate. a

m designates the inner telescoping screw. it designates the outer telescoping screw. The inner telescoping screw is provided with a reduced portion 0 that merges with the threads through the beveled shoulder q.

' The lower end of the inner screw m is plain and adapted to slide freely in the interior of the outer screw n, which is adapted to gulde it. The interior of the outer screw 7:. is provided with a pair of key-ways r in which are adapted to engage the ends of the pin .9 that passes throughthe lower end of the inner screw 002 Hence the inner screw [is prevented from turning by the ends of gear is turned, it first turns the nut' Z which raises the inner screw m because this inner screw is held from turning movement, and consequentl must either rise or fall depending upon t e turning movement of the nut Z. When the inner screw m approaches the limit of its movement, the follower pins a, which have been riding on the threads perforaand have been kept spread, drop down upon the reduced portion 0 of the inner screw and allow the collapsible ring a to be contracted by the springs y, which press in the dogs w that engage in the slots .2 in the nut 10 which rests in the hollow space in the hub of the gear j. Heretofore this nut has been inactive but now it is coupled up to turn with the gear Consequently it being in engagement with the threads of the outer sleeve 12., which is locked from turning movement, the outer sleeve will now begin to lift and strike the bottom of the nut Z and lift the teeth k of the nut out of engagement with the teeth of thering i on the to of the gear 9'. The outer screw now W11 rise carrying the inner screw and the nut Z Patented May 24, 1921;

' make the composite lever.

with it until the studs 1? strike the contracted inside portion of the housing and stop the movement.

One of the features of my jack is that the screws are working either on the down or up movement of the lever. This is due to the fact that a driving gear h is used on each side of the driven beveled gear j and on the down movement, for instance, the dog 2- shown in Fig. 1 and shown in Fig. 2, will ride idly over the teeth 3 of the notched hub of the gear, While the dog 4 (Fig. 2) on the opposite side having its lower jaw in engagement with the notches 3 of the opposite notched hub will turn this hub and the beveled gear j in a clockwise direction, thereby turning the nut Z in a similar direction and serving to push the inner screw m up. On the up stroke of the lever 5' it will'be apparent that the dog 2 will turn the notched hub of the companion beveled gear h 'in a counterclockwise direction, continuing to rotate the gear 7' in a clockwise directionand hence continuing the lift of the screw m or the outer screw it (in case the inner screw has reached the limit of its movement and the automatic shift of the lock is operated to key the nut 10 up with the gear 7'.)

The dogs 2 and 1 are simultaneously op eratcd to bring the upper jaw of one and the lower jaw of the other into engagement with the notched hubs, or vice versa, the lower jaw of the one and the upper jaw of the other into engagement with the notched hubs by means of the pivotedyoke 6 that is supported to swing at its center on a trunnion-like extension 7 of the forging 8 that forms the handle part of the lever. The lever is .formed by a pair of yoke arms 9 that are bosse'd at 10 and perforated to fit over the ends of the gear-supporting stub shafts c and locked thereon by the cotter'pins g and which run together at their other ends and are riveted together by the rivets 11 which also pass through the extension of the handle forging 8 and unite the parts together to The intermediate portion of the yoke arms 9 spreads out into channels, as is indicated in Figs. 1 and 2, and also form a fork 12 in which is adapted to pivot the composite pin 13 (detailed in Fig. 9) that passes through a lost motion opening 20 in the dog 2 or 4 of such shape as to turn the dog with it but allow a limited lost motion to allow the dog enough independent movement to ride over the teeth when not in action. The crank 14 is fitted on to the pin so as to turn the same with the viously when the finger piece 17 of the dogshifting yoke 6 is raised or lowered, it presses the tails of these two dogs one below and one above the dead center line of'the toggles. Hence the compression spring tends to keep the dogs in either position they have been brought. Obviously when one dog is in one position the other dog is in the reversed position. They are always set by this yoke so as to be in position to cause. either the screws to raise or lower depending upon which action is desired, and are never so that the two gears h are locked against each other.

What I claim is: i

. 1. In a jack, the combination of a stand: ard, .a pair of telescoping screw lifting membersin the standard, a pair of nuts one for actuating each screw, a gear for actuating the nuts one at a time, and means for coupling up the gear to the nuts selectably so that when one screw has reached the limit of its movement the other nut is connected with the gear to actuate the other screw.

2. In a jack, the combination of a stand ard, a pair of telescopingscrew lifting members, a pair of nuts for lifting the screws, an actuating member for rotating the nuts, and means for coupling up the actuating member to the other nut when the limit of movement of the first-actuated screw is reached.

3. In a jack, the combination of a standard, a. pair of telescoping screw lifting members, a pair of nuts one for actuating each screw member, a gear for turning the nuts, and means for automatically connecting the gear with the nut for actuating the second screwwhen the firstscrew has reached th limit of its movement.

4. In a jack, the combination of'a standard, a pair of telescoping screw lifting members, nuts one for operating each screw, a

gear for turning the nuts alternately, and,

means for automatically coupling the gear up to the other nut when the limit of move ment of the screw actuated by the first-actuated nut is reached. 1

5. The combination of a standard, a pair of telescoping screws to act as lifting members, a pair of nuts one for actuating each screw, a gear for actuating the nuts, a toothed connection between the gear and one of the nuts, a. spring-actuated coupling arrangement between the gear and the other nut, and means for normally holding said spring-actuated coupling out of engagement with the other nut until the inner screw has reached the limit of its movement, the surface of the inner screw being provided with means to release said holding means to allow the spring-actuated coupling members toengage the gear and nut when the inner screw has reached the limit of its movement.

6. In a jack, the combination of a stand- 1 ported therein, a pair 0 nuts, an upper one and a lower one, a gear .for turning the nuts, a toothed connection between the; gear and the upper nut for actuating the inner screw, a plurality of spring-pressed dogs carried on the gear for coupling the gear to the lower nut, a segmental rin and following pins for engaging the sur ace of-the inner screwto normally hold the springwith the lower' nut, the said inner screw being provided with-a reduced end portion adapted to allow the ring and followin' pins to release the dogs when thelimit 0 movement of the inner screw is reached.

7. In a jack, the combination of a standard, a lifting screw supported therein, a gear for actuating the same, a pair of drivmg gears therefor one on each side of the said driven gear, notched hubs for each driving" gear, a yoke-like handle lever adapted to straddle the gears, double jaw dogs on the yoke ends of the handle, a

springin connection with "each double jaw dog arranged therewith to be thrown by the center line when the dog is moved to' bring one or the other of the jaws in engagement with the notched hub, and a member which can be thrown to bring the one jaw of one dog into engagement with the hub and the opposite jaw of the other dog into engagement with the other notched hub.

8. In a jack, a housing formed of 'a pair of pressed-steel parts, one parthaving a gear-supporting shaft introduced from the outside thereof, and an end upset on the inside of the pressed-steel part, the two pressed-steel parts being then Welded together at their meeting edges.

9. In a jack, the combination of a standard, a gear whose revolution raises or lowers the standard, a pair of gears on the opposite side of the first-mentioned gear for actuating the same, a lever prov1ded with a yoke-hke end adaptedto straddle the said gears, dogs on the end of the lever for engaging the gears to actuate the same, a dogactuating-device for simultaneously engaging one dog and disengaging the other dog, each connection of said device with the dogs embodying a lost motion arrangement to permit the dogs to ride over the teeth that g they engage in their non-active movement. pressed dogs outfof coupling arrangement.

10. In a jack, the combination of a standard, a lift ng member therein, a gear for operating the lifting member, a pair of 1 gears on opposite sides of the first-menpivotally carried on the yoke-like end of said lever, means between the dogs and the yoke-like ends of the lever for maintaining the dogs in their active'or inactive position,

and a member pivoted on the'yoke-like end of the lever for simultaneously throwing onedog out of active, relation with its gear f and the other dog-into active relation'with its gear and including a lost motion connection with each dog permitting movement of the dog in riding inactively over the teeth 1t engages;

11. In a jack, a housin formed of a pair of channels with turne -out flanges, one

channel having a gear-supporting shaft in-- troduced from the outside thereof and an end upset on the inside of the channel, the two channels being then secured together along their flanges.

12. In a jack, a housing formedof a pair of channels, one channel having a gear-supporting shaft provided with a collar introduced" from the outside thereof, the collar limiting the amount that the shaft may be inti'b'duced into the channel, and an end upset on the inside of the channel, the two channels being secured together at their meeting edges.

p In testimony whereof I aflix my signature.

HENRY T. GIBBARD. 

